123213210 has 32 divisors (see below), whose sum is σ = 296013312. Its totient is φ = 32823360.

The previous prime is 123213203. The next prime is 123213247. The reversal of 123213210 is 12312321.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 123213210.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45700 + ... + 48320.

It is an arithmetic number, because the mean of its divisors is an integer number (9250416).

Almost surely, 2^123213210 is an apocalyptic number.

123213210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123213210 is an abundant number, since it is smaller than the sum of its proper divisors (172800102).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123213210 is a wasteful number, since it uses less digits than its factorization.

123213210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4198.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 123213210 is about 11100.1445936528. The cubic root of 123213210 is about 497.6061707869.

Adding to 123213210 its reverse (12312321), we get a palindrome (135525531).

The spelling of 123213210 in words is "one hundred twenty-three million, two hundred thirteen thousand, two hundred ten".